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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_VIZ_COMMON_FRAME_SINKS_DELAY_BASED_TIME_SOURCE_H_
#define COMPONENTS_VIZ_COMMON_FRAME_SINKS_DELAY_BASED_TIME_SOURCE_H_
#include <memory>
#include <string>
#include "base/cancelable_callback.h"
#include "base/memory/raw_ptr.h"
#include "base/time/time.h"
#include "base/timer/timer.h"
#include "components/viz/common/viz_common_export.h"
namespace base {
namespace trace_event {
class TracedValue;
}
class SingleThreadTaskRunner;
} // namespace base
namespace viz {
class VIZ_COMMON_EXPORT DelayBasedTimeSourceClient {
public:
virtual void OnTimerTick() = 0;
protected:
virtual ~DelayBasedTimeSourceClient() = default;
};
// This timer implements a time source that achieves the specified interval
// in face of millisecond-precision delayed callbacks and random queueing
// delays. DelayBasedTimeSource uses base::TimeTicks::Now as its timebase.
class VIZ_COMMON_EXPORT DelayBasedTimeSource {
public:
explicit DelayBasedTimeSource(base::SingleThreadTaskRunner* task_runner);
DelayBasedTimeSource(const DelayBasedTimeSource&) = delete;
DelayBasedTimeSource& operator=(const DelayBasedTimeSource&) = delete;
virtual ~DelayBasedTimeSource();
void SetClient(DelayBasedTimeSourceClient* client);
void SetTimebaseAndInterval(base::TimeTicks timebase,
base::TimeDelta interval);
base::TimeDelta Interval() const;
void SetActive(bool active);
bool Active() const;
// Get the last and next tick times. NextTickTime() returns null when
// inactive.
base::TimeTicks LastTickTime() const;
base::TimeTicks NextTickTime() const;
virtual void AsValueInto(base::trace_event::TracedValue* dict) const;
protected:
// Virtual for testing.
virtual base::TimeTicks Now() const;
virtual std::string TypeString() const;
private:
void PostNextTickTask(base::TimeTicks now);
void ResetTickTask(base::TimeTicks now);
void OnTimerTick();
raw_ptr<DelayBasedTimeSourceClient> client_;
bool active_;
base::TimeTicks timebase_;
base::TimeDelta interval_;
base::TimeTicks last_tick_time_;
base::TimeTicks next_tick_time_;
raw_ptr<base::SingleThreadTaskRunner> task_runner_;
base::RepeatingClosure tick_closure_;
base::DeadlineTimer timer_;
};
} // namespace viz
#endif // COMPONENTS_VIZ_COMMON_FRAME_SINKS_DELAY_BASED_TIME_SOURCE_H_
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